Excuse for not going in hot tub?

I need an excuse not to go into the hot tub! My dh's uncle and uncles boyfriend wants us to come sleep over. We've been avoiding them for a while. My dh hasn't been all too social after his grandma passed. Well now he's ready to socialize again and they've been begging us to stay over at their new apartment. He told me we can bring alcohol and to bring our swimsuits because they have a hot tub. Any excuses? Alcohol I'll just say I'm on medication. But I can't think of any excuse for why I can go in the pool and not the hot tub! Any ideas?

Well here's the thing.... We aren't announcing it to his family. We don't want his mom or sister in our baby's life. We haven't decided if we are okay with his uncle yet. And they will probably have to find out the hard way because his uncle has a big mouth and would tell everyone lol

Honestly, this is why I just tell people as soon as I find out. It's way easier than making excuses for why you can't do things or eat things or why you feel crappy all the time. And if I do end up having a miscarriage after I announce it, I'm obviously going to feel crappy then, too, and not want to constantly have to make excuses about why. I say just announce the pregnancy.